Answer
Surfaces are not evenly spaced.
Work Step by Step
We know ,
$V = \frac{kq}{r}$
$\frac{\Delta V}{\Delta r} = kq (\frac{\Delta r^{-1}}{\Delta r})$
$\frac{\Delta V}{\Delta r} = - \frac{kq}{r^{2}}$
Since $\frac{\Delta V}{\Delta r} $ is not constant exponential, Surfaces are not evenly spaced.
